Viscoelastic fuids do not behave like newtonian fluids and have to be explained in a different way than classical ones. In this report we will learn a bit about the models which explain viscoelastic fuids and we will base the project in the characterization and simulation of them acting in a particular experiment. This experiment is the oscillation of the fuid between infnite parallel planes. We are going to analyze and compare the obtained results with the theoretical behaviour. 2016/2017